Vinylic filler pigments

Claim 1

A PROCESS FOR PRODUCING A COLLOIDAL SIZED PIGMENT WHICH PROCESS CONSISTS ESSENTIALLY IN COLORING, IN AQUEOUS DISPERSION, COLLOIDAL SIZED VINYLIC FILLER PARTICLES AS HEREINAFTER DEFINED, BY PRECIPITATING ONTO SAID PARTICLES, FROM SOLUTION IN THE AQUEOUS PHASE OF SAID DISPERSION, AT LEAST ONE COLORING COMPONENT AS HEREINAFTER DEFINED; SAID VINYLIC FILLER MATERIAL BEING MADE UP ESSENTIALLY FO POLYMER PARTICLES IN THE COLLOIDAL SIZE RANGE OF ABOUT 5 MILLIMICRONS TO ABOUT 0.5 MICRON AVERAGE DIAMETER; SAID PARTICLES BEING THREE-DIMENSIONALLY CROSS-LINKED SO THAT EACH PARTICLE IS NON-SOLUBLE IN ANY SOLVENT THAT DOES NOT BREAK DOWN ITS PRIMARY CHAIN STRUCTURE; SAID PARTICLES HAVING BEEN PREPARED BY CROSS-LINKING POLYMERIZATION, IN AQUEOUS DISPERSION OF MONOMER MATERIAL POLYMERIZAB''E THEREIN AND SELECTED FROM THE CLASS CONSISTING OF THE POLYMERIZABLE MONOMERS CONTAINING AT LEAST ONE CARBON-TO-CARBON UNSATURATED GROUP WITH THE FURTHER LIMITATION THAT THE SELECTED MONOMER MATERIAL COMPRISES CROSS-LINKING MONOMER MATERIAL CONTAINING A PLURALITY OF SUCH CARBON-TOCARBON UNSATURATED GROUPS IN AT LEAST A SUFFICIENT AMOUNT TO EFFECT, IN SAID CROSS-LINKING POLYMERIZATION, ENOUGH CROSS-LINKING WITHIN THE PARTICLES TO RENDER THEM NONSOLUBLE AS AFORESAID; SAID COLORING COMPONENT COMPRISING A METAL COMBINED IN THE AQUEOUS PHASE IN THE FORM OF A SOLUBLE METAL COMPOUND, AND BEING PRECIPITATED ONTO THE COLLOIDAL SIZED VINYLIC FILLER PARTICLES IN AN INSOLUBLE FORM SELECTED FROM THE CLASS CONSISTING OF FREE METAL, METAL OXIDES AND INSOLUBLE METAL COMPOUNDS, AND SAID COLORING COMPONENT BEING OF SUCH SIZE THAT THE RESULTING INDIVIDUAL COLORED PARTICLES ARE STILL IN THE COLLOIDAL SIZE RANGE OF ABOUT 5 MILLIMOCRONS TO ABOUT 0.5 MICRON AVERAGE DIAMETER.